Correct way to fit a shower waste

Fitting a new shower tray. This is probably a dumb question but that
last shower leaked.
The waste I bought from plumb world
http://www.plumbworld.co.uk/1-34-solid-1-12-tail-and-2-1897-3813
It has a plastic nut and a rubber washer.
Am I right in thinking that I fit the waste to the shower tray by
putting plumbers mate underneath the flange, drop it ithrough the hole
in the tray and secure it with the washer and the nut from
underneath?
Or is it possible that the washer goes between the flange and the tray
(no plumbers mate) and just the plastic nut underneath?
Advice would be most welcome.
Eric

========================================A word of caution. Some tray manufacturers warn against using things like
Plumber's Mait / Boss white etc. as they can cause damage. Coram state
only silicone to be used - others may also do so. Worth a quick check on
your instructions if you've got them.
Cic.

Thanks for the silicone sealant suggestion.
Took a trip round the DIY's this afternoon and noticed that the
instructions on some suggest that silicone can be used under the
flange, so I thimk I will try that.
Ended up with a Universal Shallow Shower Trap from Homebase - cheap
and cheerful. One point - it would probably be best to have a 50mm
seal given building regulations. How is the seal depth measured? Is it
from
the water surface to the bottom of the trap ?
or
from the water surface to the top of the U bend.?

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